- Additional hardware support (like proprietary nVidia drivers, several game controllers, laptop-specific stuff (like some ASUS sensors etc))

- Newer core packages (kernel, graphics drivers, desktop environment). This often translates to better hardware support (especially if it's recent hardware), and often better game compatibility (newer graphics drivers often include fixes for games), and often better performance as well.

- More suitable as a general purpose OS. SteamOS heavily leans into the gaming use-case (naturally), and whilst you can use it as a regular PC, its immutable nature can make it a bit annoying depending on your workflow. Bazzite includes a bunch of useful defaults (apps/config/shortcuts) that makes it much more conducive for regular PC usage, or advanced gaming usage (like if you want to install an overclocking utility or do something more "advanced", it's far more easier and convenient).